To find the value of y when the point A(7, y) lies on the equation 5x + y = 8, we substitute x with 7 in the equation.
The equation can be rewritten as:
5(7) + y = 8
This simplifies to:
35 + y = 8
Now, to isolate y, we subtract 35 from both sides of the equation:
y = 8 – 35
y = -27
Thus, when the point A(7, y) lies on the graph of the equation, the value of y is -27.